Just to drag it back to Folk for a bit...
The scene in, I think a Miss Marple, where the cops chase a car along the esplanade at Sidmouth around the corner at the Ham and then emerge in the next shot in open countryside. All done with mirrors you know.
As to clean cars referred to earlier I like to think that those cars were probably new at the time and cherished much like the modern owner with fancy tin boxes, of course they were gleaming!